Season List

Saya Otonashi, a high school girl in Okinawa who discovers she has amnesia and is the key to defeating a race of blood-sucking monsters called Chiropterans. After being attacked by a Chiropteran, she learns her blood is the only weapon that can destroy them, and she begins a journey with her adoptive family and allies like the mysterious chevalier Hagi to fight the creatures and uncover her own past.